Vaginal infections are among the most common reasons women seek care from an OB/GYN. Yeast infections, bacterial vaginosis (BV), and sexually transmitted infections (STIs) can all cause itching, burning, discharge changes, and irritation. The challenge is that their symptoms overlap significantly, which makes self-diagnosis unreliable and self-treatment risky.
Getting the right diagnosis matters because each type of infection requires a different treatment. An antifungal cream will not resolve BV, and antibiotics for BV will not clear a yeast infection. Understanding the differences can help you know when it is time to see a provider.
What Counts as Normal Discharge?
The vagina maintains its own balance of bacteria and yeast and produces discharge as part of that process. Discharge can change throughout the menstrual cycle. It is often clearer and stretchier around ovulation and thicker or whiter at other points.
However, a sudden change accompanied by itching, burning, strong odor, pelvic pain, or discomfort during sex or urination indicates that something is wrong. Those signs point to an infection or irritation that would benefit from an evaluation.
Yeast Infections
A yeast infection is caused by an overgrowth of candida, a type of fungus that naturally exists in the vagina. When the vaginal environment shifts, candida can multiply and cause symptoms.
Common signs of a yeast infection include itching, burning, redness, and vulvar irritation. Discharge is often thick and white, sometimes described as cottage cheese-like. Yeast infections are not typically associated with a strong odor. If odor is a primary symptom, BV or trichomoniasis may be more likely.
Triggers include antibiotics, hormonal changes, pregnancy, uncontrolled blood sugar, and tight or non-breathable clothing. A single episode may respond to over-the-counter treatment, but recurrent or severe symptoms should be evaluated by a provider. In some cases, a different yeast strain may require a different medication.
Bacterial Vaginosis
BV is not an STI, though sexual activity can contribute to it. It occurs when the balance of vaginal bacteria shifts away from protective lactobacilli, raising vaginal pH.
BV commonly causes a thin, gray or white discharge and a noticeable fishy odor that may be stronger after sex or during a period. Some women experience mild burning, but intense itching is more characteristic of yeast.
BV is treated with prescription antibiotics, either oral or vaginal. Over-the-counter yeast treatments will not resolve it and may cause further irritation. BV can recur and may increase susceptibility to other infections. It can also be associated with pregnancy complications, making evaluation especially important for those who are pregnant or trying to conceive.
